2x Human (Female main, male alt), the "PvP Trinket" racial is helpful in both PvE and PvP, increased rep gain makes grinds a joke and the expertise is a nice touch to end with c:
1x Blood elf (Female) because they're sexy as hell

Dwarves don't appeal to me as I think the EMFH racial is much better than stoneform.
Draenei... 1% hit and a tiny hot, far inferior.

Since I started in WotLK I went with blood elf because I wanted to play Horde. I got in on it when one of my friends said he was rolling a paladin, and his sister's fiancee was also rolling one, so we figured we'd each play a spec and go from there. I ended up as prot, my friend went ret, and his "in-law" went holy. It made for some interesting leveling runs!

I never cared to change race really since all I did for Cataclysm was pay $30 for another 2 months. Plus I'd rather have that silence/interrupt and slight mana regen than the tauren's War Stomp.